Abrading device



?, QL'H.: fr, POS-TMA 2,245,820

ABRADING DEVCE Filed Jan. l5, 1941k Fran/L' posi/7760,

.Patented June 17, 1941 UNITED STATES PATENT F FICE ABRA'DING;` DEVICE Frank'Postma.. GlenRoeLN. J.

@.nnlication January 1941*,.Serial No. 374,571?

(c1. 511s5i 3 Claims.

This invention relates to devices for abrading and thereby truing'fworn crank pins. of crankv shafts for internal combustion engines andthe like, without removingv the crank. shaft fromtheengine, and has more particular reference to, improved abrading liners of the type adapted, to be substituted for the'bearing. liners of the. engine connecting rod as generally vdisclosedl in my U. S. Letters Patents No.. 2,153,272y dated April 4, 1939, and No. 2,167,312,` dated July 25, 1939.

An object of the present invention is to pro vide abrading liners ofV the above kind which are extremely durable and efficient, and which have intermediate abrading elements thatv may be readily applied or removed as-'required and that taper gradually to increased -thicknessfrom the ends to a point intermediatey the ends` thereof.

A more specific object of the present inven-A tion is to provide abrading liners consisting of av pair of arcuate members adapted to be, retained in correct positions with respect. to each other' and the connecting rod bearings. by means of shims integral with corresponding endsof the arcuate members and interposed between the sections of the connecting rod bearing. intermediate abrading elements ofthe arcuate members being removable and tapered gradually to increased thickness from the ends toa point intermediate the ends thereof so as to take up.theclearance between the upper and lower portions of the crank pin and the connecting rod bearing clue to adjustment yof the connectingrod bearing out of round when the sims are placedY between the sections of the connecting rod bearing. Y

More particularly, the present invention aims to provide abrading liners of the above kind including a pair of arcuate members. eachy composed of a thin iiexible outer carrier shell having a plurality of recesses or seatsin the inner `surface thereof in which flexible end and intermediate abrading elements are secured,r the shell being of uniform thickness at therecesses.. The recesses for the intermediate abrading elements are in the form of transverse groovesor guideways which removably receive said intermediate abrading elements, and each Iof said intermediate abrading elements preferably consists of a curved sheet composed of a backing. in the form,

of a thin flexible backing sheet having a layerl of paper adhesively secured to they inner surface thereof, and a layer of abrading material applied to the inner surface of saidv paper layer' and the ends of said hacking sheet so thatthe resultant abrading element gradually increases 55".

abrading'liners embodying the present invention.

FigureH 2- is a.y perspective view of one of the abradingliners-empIOyed in Figure 1.

Figure 3'is an edge elevational view thereof" and'.y y

Figure 4 is. an edge elevational'view of the intermediate. abrading element forming part of the liner shown in Figure 2.

Referring in detail to the drawing, 5 indicates anr engine connecting rod having a bearing on the lower end thereof in which is journaled the crank pini of the engine crank shaft. As is well known in the art, the bearing includes a half bearing or bearing block 1 integral with the lower end o thev connecting rod and a separate. half bearing or bearing cap 8 detachably bolted asl at 9. to the bearing block l.

In accordance with the present invention, improvedV abrading liners, conforming in general size. and shape to the usual bearing linersI of the connecting rod bearing, are provided for substitution for such usual bearing liners. Each abradingliner consists of ari arcuate member embodyingv a thin flexible outer carrier shell S adapted'to'seat against the inner surface of one of the bearing sections and provided on its inner surface with an arcuate series of abrading elements i6. ma, and I I. rThese abrading elements are ofk the samewidth as the bearing and are resilientand flexible as well as curved to sub.

yversely with vrespect to the associated carrier shell S or` by flexing' theV latter toward a straighter condition when the abrading liner is out of the connecting rod bearing. The carrier shell S` hasta shiml integral with one end thereof and is devoid of an integral shim at the other end thereof, the shim I3 being of increased thickness with respect to the thickness of -the shell S between the ribs I2, as regards one of the two abrading liners employed in connection with a particular connecting rod bearing when grinding the crank pin journaled therein. This provides the necessary clearance Ieven though the shell S and one thickness of the shim I3 integrally formed therewith are of quite thin metal. When tWo bearing liners are employed in the connecting rod bearing as shown in Figure l, the shims of both liners are disposedvbetween the same ends of the connecting rod bearing sections, no shims being placed between the re-A maining corresponding ends of the bearing sec-,

normally tensioned to expand to an arcuate form of greaterxcurvature than that of the bearing section in which it is to be used. Thus, the abrading liner will be flexed from its normal condition as shown by\full\lines in Figure 3 to the dotted line position of thisgrrre when placed withinthe connecting rod' bearing. insures intimate contact with the inner surface of the bearing section and proper conformation of the abrading liner to the crank pin when the bearing ysections of the connecting rod are bolted in place.

tions. This leaves sufficient clearance as at Il to permit the ends of the bearing-.at one side 1 to be drawn together as the grinding operation proceeds. Also, it Will be apparent that the liner sections may be employed with bearings of many different sizes, it being immaterial that the ends of the liners having no shims may not 'come together and may be spaced various distances" apart when employed in different sized bearings.

Each abrading element I0 and Illa consists of a thin flexible backing sheet llhavinggranu-A lar abradingmaterial or abrading clothlapplied to the inner surface thereof. These end abrading elements/I0 and Illa are preferably permanently .secured to the ends of the shell S as they do not perform a great amount ofvabrading'work in use and will last a long period of time. without4 renewal.

In other words, the major part of the abrading operation is performed byv the intery mediate abrading elements II, and the latter are accordingly made removable so thatv theyvmayry be readily renewedy at the frequent intervals re` quired. Preferably, the intermediate abrading elementsv II arev of a coarser nature than.the

end abrading elements III and Illa, although they intermediate abrading elements various grit sizes.

In use, the abrading liners are placed in the bearing and clamped or bolted therein by the bolts 9, whereupon the -crank shaft is rotated I,by any suitable means so as to subject the journal 'or'crank pin of the crank shaft to the abrading action of theabrading liners. As the abrading operation proceeds, the clearance I4 at one side of the bearing may be taken up, and the intermediate abrading elements II may be renewed as found necessary.

. From the foregoing description, it will be seen l that I have provided efficient abrading liners which will be economical to manufacture, as Well as convenient to use and highly efficient in operation. Minor changes in the specific details illustrated and described are contemplated within the spirit and scope of the invention as claimed.

What I claim as new is: l.-As a new article of manufacture, abrading liners for engine crankV shaft bearings, consisting of a pair of arcuateouter carrier shells of relatively thin flexible metal adapted to seat against the bore of the bearing and having transverse recesses in the inner faces thereof intermediate'the ends of the same, said carrier shells having shims integral with corresponding ends ,Y thereof andl having their other ends devoid of 40' may be used in# The intermediate abrading elements-'II aretapered gradually to increased thickness from the ends to a point intermediate the 1ends there-- of so as to take up the clearancebetween the upper and lower portions of the crankpin and the connecting rod bearing due to adjustment of the connecting rod bearing out of roundwhen the shims I3 are placed between the sections of the connecting rod bearing. Each of said intermediate abrading elements II preferably consists of a curved sheet composed of a backing in the form of a flexible backingsheet tapered thinner toward its ends or a backing sheet ofuniform thickness as at I1 having a layer vof shims, and end and intermediate abrading elements secured on the inner facesof said carrier shells,.said intermediate abrading elements being removably-'disposed in said recesses and composed of thin flexible members having abrading inner surfaces and tapering thicker from the ends to a point intermediate the ends thereof.

2.,As anew article of manufacture, abrading v linersfor engine crank shaft bearings, consisting ofa pair of arcuate outer carrier shells of relatively thin flexible metal adapted to seat against the bore of the bearing and having transverse recesses in the inner faces thereof intermediate the ends of the same, said carrier shells i having shims integral with corresponding ends paper I8 adhesively secured to the central portion of the inner surface thereof, andf'a layer of abrading material or abrading cloth ,I S applied to the inner surface of tapered yba'ckingsheet or of said paper layer I- and the ends of' said backing sheet I'l, so that the resultant abrading element gradually increases in thickness from the ends to a point intermediate'the ends'ithereof as stated. By tapering this removable abrading element in this way, the carrier shell S may be made of thin flexible material of substantially uniform thickness throughout except at the-ribs I2, but thin enough to be used in connecting rods where clearances are very small. The

tapered abrasive insert is therefore of great importance, and the same carrier shells may be used continuously with periodical replacement of the intermediate abrasive inserts: Preferably, the abrading liner lis of a springt' V nature and thereofv and havingtheir other ends devoid of shims, and end and intermediate abrading elements secured on the inner faces of said carrier shells, said intermediate abrading elements being removablyl disposed in said recesses and composed of--thin flexible members having abrading inner surfaces and tapering thicker from the ends to a point intermediate the ends thereof, said end abrading elementsvbeing of a less coarse` nature I than the intermediate abrading elements and permanently secured in place.

3. As a new article of manufacture, abrading liners for engine crank shaft bearings, consisting of a pair of arcuate outer carrier shells of relatively thin flexible metal adapted to seat against the bore of the bearing and having Vtransverse yrecesses in the inner faces thereof intermediate the ends of the same, said carrier shells having shims integral with corresponding ends thereof and having their other ends-devoid 0f shims, and end and intermediate abrading elements secured on the inner'faces of said carrier l shells said intermediate abrading elements being removably disposed in said recesses and composed of thin exible membershaving abrading inner surfaces and tapering thicker from the ends to a point intermediate the ends thereof, said flexible member consisting of a backing in the form of a thin flexible backing sheet having a layer of paper adhesively secured to the central portion of the inner surface thereof and a layer of abrading material appliedA to the inner surface of said 5` paper layer and the' ends of said backing sheet.

FRANK POSTMA. 

